私はより良い (より良いと思います) 再利用可能な WndProc プロシージャを作成しようとしていますが、以下のコードは機能しません。合理的なコース。
しかし、このトリックが実行できることはわかっています。なぜなら、以前に、どこで見たのか覚えていないサードパーティ クラスで、多くのカスタム引数を持つこの同じ wndproc サブルーチンを見たことがあるからです。トリック。
次に、誰かがこのコードを修正し、何か問題がある場合は改善するのを手伝ってくれますか?
また、このような改造を行った演出について、何か特筆すべき点はありますか？このようなことが何らかの形でパフォーマンスに影響を与える可能性があるかどうかは本当にわかりません.
''' <summary>
''' Windows Message Identifiers.
''' </summary>
Private Enum Messages As Integer
''' <summary>
''' Message is sent when the user chooses a command from the system menu,
''' or when the user chooses the "maximize", "minimize", "restore", or "close" buttons.
''' </summary>
WM_SYSCOMMAND = &H112
End Enum
''' <summary>
''' Intercepts Windows messages for this Window.
''' </summary>
''' <param name="MsgInt32">
''' Message Identifier as Integer.
''' </param>
''' <param name="MsgWin32">
''' Message Identifier as Win32Hex format.
''' </param>
''' <param name="MsgHex">
''' Message Identifier as Hexadecimal format.
''' </param>
''' <param name="HWnd">
''' Window Handle.
''' </param>
''' <param name="LParam">
''' LParan message argument.
''' </param>
''' <param name="WParam">
''' WParam message argument.
''' </param>
''' <param name="Result">
''' Specifies the value that is returned to window in response to handling the message.
''' </param>
Protected Overrides Sub WndProc(ByRef m as Message,
ByRef MsgInt32 As Integer
ByRef MsgWin32 As String,
ByRef MsgHex As String,
ByRef HWnd As IntPtr,
ByRef LParam As IntPtr,
ByRef WParam As IntPtr,
ByRef Result As IntPtr)
Select Case MsgInt32
Case Messages.WM_SYSCOMMAND
MsgBox(MsgWin32)
MsgBox(LParam)
MsgBox(WParam)
End Select
' Return control to base message handler.
MyBase.WndProc(m, CInt(m.Msg), "&H" & Hex(m.Msg), Hex(m.Msg), m.HWnd, m.LParam, m.WParam, m.Result)
End Sub
アップデート：
メッセージを簡単に管理するために再現する元のコードの 1 つを見つけました。
Public Declare Function CallWindowProc Lib "user32.dll" Alias "CallWindowProcA" (ByVal _
lpPrevWndFunc As Long, ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam _
As Long, ByVal lParam As Long) As Long
Public Delegate Function ipWindowProc(ByVal hwnd As Integer, ByVal uMsg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
Dim ip As ipWindowProc = AddressOf Me.WindowProc
' The following function acts as Form1's window procedure to process messages.
Public Function WindowProc(ByVal hwnd As Integer, ByVal uMsg As Integer, ByVal wParam As Integer, ByVal lParam As Integer) As Integer
Dim bTopMost As Boolean = Me.TopMost
Dim hMenu As Integer = 0
Dim iRet As Integer = 0
Dim mii As MENUITEMINFO
Select Case uMsg
Case WM_INITMENU
hMenu = GetSystemMenu(hwnd, 0)
mii.cbSize = Len(mii)
mii.fMask = MIIM_STATE
If bTopMost = True Then
mii.fState = MFS_ENABLED Or MFS_CHECKED
Else
mii.fState = MFS_ENABLED Or 0
End If
iRet = SetMenuItemInfo(hMenu, 1, 0, mii)
WindowProc = 0
Case WM_SYSCOMMAND
If wParam = 1 Then
mii.cbSize = Len(mii)
mii.fMask = MIIM_STATE
If bTopMost = True Then
mii.fState = MFS_ENABLED Or 0
iRet = SetMenuItemInfo(hMenu, 1, 0, mii)
Me.TopMost = False
Else
mii.fState = MFS_ENABLED Or MFS_CHECKED
iRet = SetMenuItemInfo(hMenu, 1, 0, mii)
Me.TopMost = True
End If
WindowProc = 0
Else
WindowProc = CallWindowProc(ioProc, hwnd, uMsg, wParam, lParam)
End If
Case Else
WindowProc = CallWindowProc(ioProc, hwnd, uMsg, wParam, lParam)
End Select
End Function
更新 2
さて、上記のコードからこれを翻訳しましたが、上記のコードのように wndproc の代替として機能させるために追加する必要があるのは何ですか?
public class form1
<System.Runtime.InteropServices.
DllImport("user32.dll")>
Private Shared Function CallWindowProc(
ByVal lpPrevWndFunc As WndProcDelegate,
ByVal hWnd As IntPtr,
ByVal Msg As UInteger,
ByVal wParam As IntPtr,
ByVal lParam As IntPtr
) As IntPtr
End Function
Delegate Function WndProcDelegate(
ByVal hWnd As IntPtr,
ByVal msg As UInteger,
ByVal wParam As IntPtr,
ByVal lParam As IntPtr
) As IntPtr
''' <summary>
''' Process Windows messages.
''' This function acts as wndproc.
''' </summary>
Public Function WindowProc(ByVal hwnd As IntPtr,
ByVal uMsg As UInteger,
ByVal wParam As IntPtr,
ByVal lParam As IntPtr) As Integer
Select Case uMsg
Case &H112
MsgBox("Message intercepted!")
End Select
End Function
End class
